Here's how to take a screenshot in Android, Windows Phone, and iOS
Today, in this otherwise simple how-to, we'll try to create a comprehensive list of of manufacturers and how they go about taking a screenshot. You'd think that it would be uniform throughout, but it actually isn't necessarily so, especially throughout the different platforms.
Take a screenshot on iOS
All iPhones behave uniformly in this regard. Just simultaneously press and hold the circular Home button and the Power/Lock button for a second and release. Voilà! The screenshot should be available in your Photos app, in the Camera Roll album.
Take a screenshot on Windows Phone 8
Windows Phone 8- and Windows Phone 8.1-based devices use a different combination to take a screenshot.
For WP8, just press and hold the Start (Windows Logo) capacitive button and the Power/Lock button at the same time. If you have a WP8.1 device, then just press the Power/Lock button and Volume Up at the same time. Resulting screenshot will be available in your Photos Hub app, in a dedicated Screenshots album.
Take a screenshot on Android
Some Android devices have a custom 'Take a Screenshot' button in their Power menu (see image on the right), available by holding down the Power button for two or so seconds. Don't worry, it'll take a screenshot of the content behind the menu itself.
If you have a Samsung phone, then you need to press down the Power/Lock button and the Home button simultaneously. Alternatively, certain Samsung phones allow you to take a screenshot by horizontally swiping the side of your hand across the entire display, like shown on your right.
If your Android version is not as up-to-date, then, sadly, you're unable to take screenshots as easily (unless you have a Samsung, where you can usually take a screenie with the Power/Lock button and Home button combo). If your device is rooted, however, quite a few free apps on the Play Store will allow you to snap your screen, like Screenshot Easy.